1 Reply Latest reply on Dec 1, 2015 4:33 PM by Amit Katz

    Flow on a rotating impeller

    Ali Karalomlu
    Ali Karalomlu Nov 12, 2015 5:31 PM

      The picture that I attached is showing a pump which I am trying to find the flow velocity near blade surfaces. I added a cylindirical area around impeller and applied rotating frame. For the first trial my BC's are

      1) Inlet Flow Rate;

      2) Outlet Environment Pressure;

      3) Real Wall to Impeller;     

      4) Real Wall as Stator to Water touching faces inside the pump.

      As a second study I deleted the rotating frame and applied these boundaries;

      1) Inlet Flow Rate;

      2) Outlet Environment Pressure;

      3) Real Wall as Wall Motion to Impeller's Water touching faces.

      Which one do you think is the best and the most logical way to do that kind of study? 

        • Re: Flow on a rotating impeller
          Amit Katz
          Amit Katz Dec 1, 2015 4:33 PM (in response to Ali Karalomlu)

          Do not use a Real Wall condition on faces as an attempt to simulate motion, this will simply not work. The Real Wall velocity condition is meant to correctly boundary layer conditions for simulating a body in motion. For example, if you were simulating a car moving at velocity you may choose to model the ground and give it a Real Wall velocity condition matching the bulk average fluid flow, in order so that the model does not apply a non-slip boundary condition with zero velocity on the ground.

           

          For your calculation stick with a local rotating region and make sure that it covers every part of the rotor geometry.